Add vfp support on ARM. Patch from John Jozwiak.

src/arm/constants-arm.h

Index: src/arm/constants-arm.h
===================================================================
--- src/arm/constants-arm.h	(revision 3208)
+++ src/arm/constants-arm.h	(working copy)
@@ -75,6 +75,9 @@
 // Number of registers in normal ARM mode.
 static const int kNumRegisters = 16;
 
+// VFP support.
+static const int kNumVFPRegisters = 48;
+
 // PC is register 15.
 static const int kPCRegister = 15;
 static const int kNoRegister = -1;
@@ -231,6 +234,16 @@
   inline int RnField() const { return Bits(19, 16); }
   inline int RdField() const { return Bits(15, 12); }
 
+  // Support for VFP.
+  // Vn(19-16) | Vd(15-12) |  Vm(3-0)
+  inline int VnField() const { return Bits(19, 16); }
+  inline int VmField() const { return Bits(3, 0); }
+  inline int VdField() const { return Bits(15, 12); }
+  inline int NField() const { return Bit(7); }
+  inline int MField() const { return Bit(5); }
+  inline int DField() const { return Bit(22); }
+  inline int RtField() const { return Bits(15, 12); }
+
   // Fields used in Data processing instructions
   inline Opcode OpcodeField() const {
     return static_cast<Opcode>(Bits(24, 21));
@@ -315,8 +328,17 @@
   static const RegisterAlias aliases_[];
 };
 
+// Helper functions for converting between VFP register numbers and names.
+class VFPRegisters {
+ public:
+  // Return the name of the register.
+  static const char* Name(int reg);
 
+ private:
+  static const char* names_[kNumVFPRegisters];
+};
 
+
 } }  // namespace assembler::arm
 
 #endif  // V8_ARM_CONSTANTS_ARM_H_